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you want consistent colors as Spot, in CMYK and in RGB.
The color is defined as Pantone Coated spot ink 2563C.
1. Define in Photoshop your RGB space, for instance sRGB.
2. Define in Photoshop your CMYK space, for instance ISO Coated.
3. Define as well a Gray TRC, maybe Black Ink ISO Coated
(can be explained later, TRC=tone reproduction curve,
a better substitute for a single dot gain number).
4. Define as well a Spot TRC, maybe Black Ink ISO Coated.
5. Save these settings (any name)as sRGB-ISO-ISO-ISO.csf
6. Synchronize by CS# Bridge.
How to get the numbers:
Photoshop / Color Picker / Color Libraries / Pantone Coated 2563C.
Read the Lab numbers: L=70, a=24, b=-24. These are independent
of RGB and CMYK choices. Absolute references.
Back to Color Picker / Read CMYK values / Read RGB values /
Read hex values for RGB (used in HTML, practically only for sRGB).
Why is this workflow better than taking the numbers from a
printed or digital swatch book ?
Because the CMYK numbers are valid for a SPECIFIED printing
process (your choice), which contains inks, paper and dot gain.
How to check the conversion quality/robustness:
Fill a rectangle by 2563C or simply by the Lab color.
View / Proof colors for ISO Coated / Gamut warning: no problem.
View / Proof colors for sRGB / Gamut warning: no problem.
Result: this spot color can be printed by spot ink, by CMYK
ISO Coated and it can be reproduced nicely on monitors which
are near to sRGB.
If the percentages for Y and K (for the example 2563C) should
be very low , then I would try to replace these values by 0.
For ISO Coated these values are 0.
Hopefully I understood your task correctly.
Best regards --Gernot Hoffmann
that is really really great I was looking for this very information thank you a heaps I have just started forking for a print company in the outdoor banners section and at this stage a bit confused about the color codes.